Product Description
Milwaukee 1/4 in.-28 NF Straight Flute Plug Tap
Model Number: 49-57-5138
The Milwaukee 49-57-5138 is a 1/4 in.-28 NF Straight Flute Plug Tap, precision machined for creating or repairing clean, accurate internal threads. A tap cuts female threads into a drilled hole, and this plug tap is the most common general-purpose style, with a short tapered chamfer of a few threads at the tip that starts the tap square in the hole before it transitions to full-form threads, which makes it a natural fit for through-hole threading. The 1/4 in.-28 NF designation identifies a 1/4 in. diameter with 28 threads per inch in the National Fine series. Note the thread series carefully: the 1/4 in. size comes in two common threads, this fine 1/4 in.-28 and the coarser 1/4 in.-20, so match this tap to 1/4 in.-28 hardware and confirm your thread before ordering, since the two are not interchangeable. The finer 28 TPI thread is common in automotive, aerospace, hydraulic and pneumatic fittings, and precision assembly, where its shallower thread and greater holding strength in thin material are an advantage. The straight flute geometry gives the tap the versatility to handle general threading across common metals.
The tap is built for durability and lasting identification. High carbon steel construction holds a sharp cutting edge through the common metal applications it is designed for, and a protective black oxide coating resists corrosion while helping to reduce friction as the tap cuts. Milwaukee marks these taps with long-lasting laser-etched sizing rather than stamped markings, so the size and thread series stay clearly legible over the life of the tool, which matters when you carry both the 1/4 in.-20 and 1/4 in.-28 taps. The square shank is compatible with all standard tap handles and tap wrenches, so it drops right into the threading tools you already run.
This plug tap is designed for cutting threads in the most common metal applications, including brass, aluminum, mild steel, and more, which makes it a go-to for mechanics, machinists, fabricators, and maintenance crews who work with 1/4 in.-28 hardware. It handles both tapping fresh holes and chasing or repairing an existing damaged 1/4 in.-28 thread. For the cleanest finish, easiest cutting, and longest tap life, use the tap with cutting fluid to keep heat and friction down as it works.
Features
- Genuine Milwaukee 1/4 in.-28 NF Straight Flute Plug Tap
- Cuts clean, accurate internal threads in the 1/4 in.-28 NF fine thread size
- Plug tap style with a starting chamfer for square, easy starts
- Designed for through-hole threading
- Fine 1/4 in.-28 thread, distinct from the coarse 1/4 in.-20, so confirm your thread
- Common in automotive, aerospace, hydraulic fittings, and precision assembly
- High carbon steel construction for durability
- Protective black oxide coating for corrosion resistance
- Long-lasting laser-etched sizing for the clearest identification
- Square shank fits all standard tap handles and tap wrenches
- Threads brass, aluminum, mild steel, and other common metals
- Best used with cutting fluid for a clean finish and longer tap life
Specifications
- Manufacturer: Milwaukee Tool
- Part Number: 49-57-5138
- Type: Straight Flute Plug Tap
- Thread Size: 1/4 in.
- Thread Series: NF (National Fine)
- Threads Per Inch: 28
- Tap Style: Plug, for through-hole threading
- Flutes: Straight
- Material: High carbon steel
- Finish: Black oxide
- Shank: Square, fits standard tap handles and wrenches
- Materials Threaded: Brass, aluminum, mild steel, and other common metals
- Part Type: Genuine Milwaukee Accessory
Includes
- (1) Milwaukee 49-57-5138 1/4 in.-28 NF Straight Flute Plug Tap
